Free Online JSON Viewer & Tree Parser
Paste or upload JSON to explore nested objects and arrays as a collapsible tree. Built for API responses and config files—everything stays in your browser.
JSON
Features
Collapsible tree
Expand and collapse objects and arrays to find nested fields without scrolling a wall of text.
Types and paths
Inspect each node’s type and path so you can match API docs or copy a lookup path.
Inline syntax errors
Invalid JSON switches back to the code view with line numbers; the tree returns once it parses.
Private by default
Parsing runs locally. Tokens and personal data never leave your device.
FAQ
- Viewer vs formatter?
- The formatter pretty-prints text. The viewer shows structure as a tree. This page opens in tree view; you can still switch to code or table.
- Why do I see the code editor first?
- Paste valid JSON first. After it parses, the tree appears automatically. Use “Load example” to try it immediately.
- Is my JSON uploaded?
- No. The tree is built in your browser.